A micrometre is one millionth of a metre. Smaller units than a micrometre are:
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A micrometre is shorter.
A thousandth of a micrometre is a nanometre. A thousandth of that is a picometre. A thousandth of that is a femtometre. A thousandth of that is a attometre. A thousandth of that is a zeptometre. A thousandth of that is a yoctometre. There is also 1/10 nanometre, which is known as the Angstrom unit. An alternative answer to the question is, half a micrometre, a thrid of a micrometre, a quarter of a micrometre etc.
A micrometre ■
A micrometre, which is also known as a micron.
A micrometre is a unit of length. A decilitre is a unit of capacity. The two units are therefore incompatible.